From owner-freebsd-questions Thu Aug 12 4: 7: 8 1999 Delivered-To: freebsd-questions@freebsd.org Received: from ares.maths.adelaide.edu.au (Ares.maths.adelaide.edu.au [129.127.44.147]) by hub.freebsd.org (Postfix) with ESMTP id 813F514D63 for ; Thu, 12 Aug 1999 04:06:33 -0700 (PDT) (envelope-from glewis@ares.maths.adelaide.edu.au) Received: (from glewis@localhost) by ares.maths.adelaide.edu.au (8.9.3/8.9.3) id UAA91478; Thu, 12 Aug 1999 20:37:56 +0930 (CST) (envelope-from glewis) From: Greg Lewis Message-Id: <199908121107.UAA91478@ares.maths.adelaide.edu.au> Subject: Re: SMP and MEM In-Reply-To: from Andrew MacIntyre at "Aug 12, 1999 09:22:02 am" To: Andrew MacIntyre Date: Thu, 12 Aug 1999 20:37:56 +0930 (CST) Cc: lyz@ems.guangzhou.gd.cn, freebsd-questions@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL56 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > > 2. The other question is my compaq 3000 server down again and again when MEM > > > increase to 1 G. > > > I have set the option in kernel like this: > > > > > > > > > options "MAXMEM=(1024*1024)" > > > > > > > > > appreciate for your help. > > > > Right. So you've compiled a kernel which insists that your machine has > > 1G of physical RAM yet you state above that it has 512 M. I'm guessing > > this is a Bad Thing [TM]. You only need to specify MAXMEM if FreeBSD > > isn't detecting the amount of RAM you have correctly. > > Compaqs are a PITA. You have to do this to get any more than 16M usable. > I did think that the startup code still checked how much memory actually > existed (why is it called _MAX_MEM?). I'm still not convinced specifying MAXMEM _incorrectly_ is a good thing :). Certainly you sometimes need to specify the correct amount of memory if your BIOS is fibbing and FreeBSD can't work it out. > There has however been an extensive thread in the last day or two on a > similar issue, with the observation that FreeBSD is known to work > reliably on machines with 1G of real memory, but that considerable > care/knowledge is required to find the right memory to actually get a > reliable system with 1G. There seem to be lots of electrical and memory > spec gotchas for many motherboards that claim to support this much memory. Yep, have been following this thread on freebsd-stable :). -- Greg Lewis glewis@trc.adelaide.edu.au Computing Officer +61 8 8303 5083 Teletraffic Research Centre To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message